One shot in episode 5x4. Espo and Ryan have Castle on the phone talking about how they are trying to figure out who Beckett's new boyfriend is, not knowing that Beckett's new boyfriend is Castle and she's with him, not knowing she hears Espo asking Castle if he's going to be ok now that Beckett is dating someone again.

"Castle, are you going to be alright with this?"

"Ok, with what Espo?"

"Ok, with the fact that Beckett is seeing someone, we all know how you feel about her. And this is like a repeat of what happened between you two 2 ½ years ago. Only this time, its Beckett's is away with someone, while once again you're up in the Hamptons. 'Writing'. Bro, you're a member of our little family now, and I'm not gonna stand by and watch you fall apart again."

Castle looks at Beckett who has a horrified expression on her face. Castle is shocked as well, he really didn't think they would think so much into this.

"Castle, are you there?"

"Yeah, Espo, I'm here. Look I'm going to be just fine, a lot has changed since then." With a smirk at Beckett, "I am a grown man, I can deal with Beckett being with someone"

"You say that now Castle, but we all know what will happen eventually. You won't be able to be around her anymore and you'll finally listen to your family and walk away from consulting with us"

That last line gets Castle a shocked look from Beckett, who mouths "You're family tried talking you out of working with me?"

Castle mouths back "We will discuss it later"

"Espo, look if you can get anything on this murder here let me know, I'm going to get back to researching on my end, and will you call back if I find anything, Bye Espo"

"Bye Castle"

Looking at Kate, Castle sighs.

"What did he mean that your family asked you to walk away from me? When?"

"Kate, the first serious time was after you were shot. It scared Alexis, I tried to jump in front of you and the second time was with my mother after the bombing. I had just found out that you had lied to me about remembering and, she told me I needed to walk away that love wasn't switch that you can't just turn love off"

"Rick, I am so sorry for all of that, -"

"Kate, that is in the past, what matters is we are here together, that is all that matters. My mother and Alexis don't feel that way anymore. You should have seen how excited they were yesterday as I was getting ready to pick you up and come up here."